[frontendmasters] Fix issues and improve extraction (closes #3661, closes #16328)

1 files changed, 262 insertions, 0 deletions

diff --git a/youtube_dl/extractor/frontendmasters.py b/youtube_dl/extractor/frontendmasters.py
new file mode 100644
index 000000000..770db46d0
--- /dev/null
+++ b/youtube_dl/extractor/frontendmasters.py
@@ -0,0 +1,262 @@
+# coding: utf-8
+from __future__ import unicode_literals
+
+import re
+
+from .common import InfoExtractor
+from ..compat import (
+    compat_str,
+    compat_urlparse,
+)
+from ..utils import (
+    ExtractorError,
+    parse_duration,
+    urlencode_postdata,
+)
+
+
+class FrontendMastersBaseIE(InfoExtractor):
+    _API_BASE = 'https://api.frontendmasters.com/v1/kabuki'
+    _LOGIN_URL = 'https://frontendmasters.com/login/'
+
+    _NETRC_MACHINE = 'frontendmasters'
+
+    _QUALITIES = {
+        'low': {'width': 480, 'height': 360},
+        'mid': {'width': 1280, 'height': 720},
+        'high': {'width': 1920, 'height': 1080}
+    }
+
+    def _real_initialize(self):
+        self._login()
+
+    def _login(self):
+        (username, password) = self._get_login_info()
+        if username is None:
+            return
+
+        login_page = self._download_webpage(
+            self._LOGIN_URL, None, 'Downloading login page')
+
+        login_form = self._hidden_inputs(login_page)
+
+        login_form.update({
+            'username': username,
+            'password': password
+        })
+
+        post_url = self._search_regex(
+            r'<form[^>]+action=(["\'])(?P<url>.+?)\1', login_page,
+            'post_url', default=self._LOGIN_URL, group='url')
+
+        if not post_url.startswith('http'):
+            post_url = compat_urlparse.urljoin(self._LOGIN_URL, post_url)
+
+        response = self._download_webpage(
+            post_url, None, 'Logging in', data=urlencode_postdata(login_form),
+            headers={'Content-Type': 'application/x-www-form-urlencoded'})
+
+        # Successful login
+        if any(p in response for p in (
+                'wp-login.php?action=logout', '>Logout')):
+            return
+
+        error = self._html_search_regex(
+            r'class=(["\'])(?:(?!\1).)*\bMessageAlert\b(?:(?!\1).)*\1[^>]*>(?P<error>[^<]+)<',
+            response, 'error message', default=None, group='error')
+        if error:
+            raise ExtractorError('Unable to login: %s' % error, expected=True)
+        raise ExtractorError('Unable to log in')
+
+
+class FrontendMastersPageBaseIE(FrontendMastersBaseIE):
+    def _download_course(self, course_name, url):
+        return self._download_json(
+            '%s/courses/%s' % (self._API_BASE, course_name), course_name,
+            'Downloading course JSON', headers={'Referer': url})
+
+    @staticmethod
+    def _extract_chapters(course):
+        chapters = []
+        lesson_elements = course.get('lessonElements')
+        if isinstance(lesson_elements, list):
+            chapters = [e for e in lesson_elements if isinstance(e, compat_str)]
+        return chapters
+
+    @staticmethod
+    def _extract_lesson(chapters, lesson_id, lesson):
+        title = lesson.get('title') or lesson_id
+        display_id = lesson.get('slug')
+        description = lesson.get('description')
+        thumbnail = lesson.get('thumbnail')
+
+        chapter_number = None
+        index = lesson.get('index')
+        element_index = lesson.get('elementIndex')
+        if (isinstance(index, int) and isinstance(element_index, int) and
+                index < element_index):
+            chapter_number = element_index - index
+        chapter = (chapters[chapter_number - 1]
+                   if chapter_number - 1 < len(chapters) else None)
+
+        duration = None
+        timestamp = lesson.get('timestamp')
+        if isinstance(timestamp, compat_str):
+            mobj = re.search(
+                r'(?P<start>\d{1,2}:\d{1,2}:\d{1,2})\s*-(?P<end>\s*\d{1,2}:\d{1,2}:\d{1,2})',
+                timestamp)
+            if mobj:
+                duration = parse_duration(mobj.group('end')) - parse_duration(
+                    mobj.group('start'))
+
+        return {
+            '_type': 'url_transparent',
+            'url': 'frontendmasters:%s' % lesson_id,
+            'ie_key': FrontendMastersIE.ie_key(),
+            'id': lesson_id,
+            'display_id': display_id,
+            'title': title,
+            'description': description,
+            'thumbnail': thumbnail,
+            'duration': duration,
+            'chapter': chapter,
+            'chapter_number': chapter_number,
+        }
+
+
+class FrontendMastersIE(FrontendMastersBaseIE):
+    _VALID_URL = r'(?:frontendmasters:|https?://api\.frontendmasters\.com/v\d+/kabuki/video/)(?P<id>[^/]+)'
+    _TESTS = [{
+        'url': 'https://api.frontendmasters.com/v1/kabuki/video/a2qogef6ba',
+        'md5': '7f161159710d6b7016a4f4af6fcb05e2',
+        'info_dict': {
+            'id': 'a2qogef6ba',
+            'ext': 'mp4',
+            'title': 'a2qogef6ba',
+        },
+        'skip': 'Requires FrontendMasters account credentials',
+    }, {
+        'url': 'frontendmasters:a2qogef6ba',
+        'only_matching': True,
+    }]
+
+    def _real_extract(self, url):
+        lesson_id = self._match_id(url)
+
+        source_url = '%s/video/%s/source' % (self._API_BASE, lesson_id)
+
+        formats = []
+        for ext in ('webm', 'mp4'):
+            for quality in ('low', 'mid', 'high'):
+                resolution = self._QUALITIES[quality].copy()
+                format_id = '%s-%s' % (ext, quality)
+                format_url = self._download_json(
+                    source_url, lesson_id,
+                    'Downloading %s source JSON' % format_id, query={
+                        'f': ext,
+                        'r': resolution['height'],
+                    }, headers={
+                        'Referer': url,
+                    }, fatal=False)['url']
+
+                if not format_url:
+                    continue
+
+                f = resolution.copy()
+                f.update({
+                    'url': format_url,
+                    'ext': ext,
+                    'format_id': format_id,
+                })
+                formats.append(f)
+        self._sort_formats(formats)
+
+        subtitles = {
+            'en': [{
+                'url': '%s/transcripts/%s.vtt' % (self._API_BASE, lesson_id),
+            }]
+        }
+
+        return {
+            'id': lesson_id,
+            'title': lesson_id,
+            'formats': formats,
+            'subtitles': subtitles
+        }
+
+
+class FrontendMastersLessonIE(FrontendMastersPageBaseIE):
+    _VALID_URL = r'https?://(?:www\.)?frontendmasters\.com/courses/(?P<course_name>[^/]+)/(?P<lesson_name>[^/]+)'
+    _TEST = {
+        'url': 'https://frontendmasters.com/courses/web-development/tools',
+        'info_dict': {
+            'id': 'a2qogef6ba',
+            'display_id': 'tools',
+            'ext': 'mp4',
+            'title': 'Tools',
+            'description': 'md5:82c1ea6472e88ed5acd1829fe992e4f7',
+            'thumbnail': r're:^https?://.*\.jpg$',
+            'chapter': 'Introduction',
+            'chapter_number': 1,
+        },
+        'params': {
+            'skip_download': True,
+        },
+        'skip': 'Requires FrontendMasters account credentials',
+    }
+
+    def _real_extract(self, url):
+        mobj = re.match(self._VALID_URL, url)
+        course_name, lesson_name = mobj.group('course_name', 'lesson_name')
+
+        course = self._download_course(course_name, url)
+
+        lesson_id, lesson = next(
+            (video_id, data)
+            for video_id, data in course['lessonData'].items()
+            if data.get('slug') == lesson_name)
+
+        chapters = self._extract_chapters(course)
+        return self._extract_lesson(chapters, lesson_id, lesson)
+
+
+class FrontendMastersCourseIE(FrontendMastersPageBaseIE):
+    _VALID_URL = r'https?://(?:www\.)?frontendmasters\.com/courses/(?P<id>[^/]+)'
+    _TEST = {
+        'url': 'https://frontendmasters.com/courses/web-development/',
+        'info_dict': {
+            'id': 'web-development',
+            'title': 'Introduction to Web Development',
+            'description': 'md5:9317e6e842098bf725d62360e52d49a6',
+        },
+        'playlist_count': 81,
+        'skip': 'Requires FrontendMasters account credentials',
+    }
+
+    @classmethod
+    def suitable(cls, url):
+        return False if FrontendMastersLessonIE.suitable(url) else super(
+            FrontendMastersBaseIE, cls).suitable(url)
+
+    def _real_extract(self, url):
+        course_name = self._match_id(url)
+
+        course = self._download_course(course_name, url)
+
+        chapters = self._extract_chapters(course)
+
+        lessons = sorted(
+            course['lessonData'].values(), key=lambda data: data['index'])
+
+        entries = []
+        for lesson in lessons:
+            lesson_name = lesson.get('slug')
+            if not lesson_name:
+                continue
+            lesson_id = lesson.get('hash') or lesson.get('statsId')
+            entries.append(self._extract_lesson(chapters, lesson_id, lesson))
+
+        title = course.get('title')
+        description = course.get('description')
+
+        return self.playlist_result(entries, course_name, title, description)